Prosecutors say Contreras was out for revenge the night of Aug. 10, 2008. He was recovering from a gunshot wound to the shoulder, delivered by a member of a rival gang.

That was when he spotted Jason Mueller, 29, who was trying to hail a cab at Grand and Wolcott avenues in the Ukrainian Village neighborhood.

Mueller had gone to a club after leaving work, and had then driven a friend home in the friend’s car, prosecutors said at the time. But he was not part of the gang Contreras was out against, or any other gang, for that matter.

Mueller was, in fact, the owner of Nonna’s Italian Pizzeria, located at 1543 N. Sedgwick St.